In the Parameters section, under Value, populate the field with the new folder name, followed by a forward slash (/) and the GSB file name.

Note:For example, the Value field for a new transformation for Scotland with the name scotland1.gsb would be populated with 'scotland/scotland1.gsb'.

In the Create Custom Geographic Transformation dialog box, click OK.

Version 10.0:The custom transformation file is created in '%User_Profile%\Application Data\ESRI\Desktop10.0\ArcToolbox\Custom Transformations'.

Version 9.3.1 and prior versions:The custom transformation file is created in '%User_Profile%\Application Data\ESRI\ArcToolbox\Custom Transformations'.

The file has the name assigned in Step 3 above with a .gtf extension. The new transformation will be available for use in the Project Tool in ArcToolbox, as well as in the Geographic Coordinate System Transformations dialog box in ArcMap.

Warning:If ArcMap is open when the new transformation is created, ArcMap will need to be shut down and restarted in order to use the new transformation in the map document.

Note:The NTv2 grid file and the new geographic transformation file are not removed when ArcGIS is uninstalled.

Note:To install the custom geographic transformation on another computer, copy the .GTF file to the other computer at the same path in the User Profile directory, and install the transformation grid .GSB file on that computer as described in Steps 1 and 2.

When the new Geographic Transformation has been created, the Projection Engine in ArcGIS Desktop will execute the transformation in either direction, as the software does with the transformations installed with the program. For more information refer to the link below to article "Select the correct geographic (datum) transformation when projecting between datums".